comScore has released its latest mobile report, and it shouldn’t come as a surprise to any Android enthusiast. Following Canalys’ recent report, comScore is now reporting that at the end of December, Android took second place away from iOS in the U.S. market. We’re not talking about sales here, this is overall market share. Meaning there are now more Android phones than iPhones out there. This is a significant milestone for Android, a platform that has taken the world by storm in just two years. Let’s take a look at the numbers shall we.

Android now commands 28.7% of the U.S smartphone market, compared to 21.4% in September of last year — and 5.2% a year ago. In just a year, Android has gone from being an underdog in last place to a force to be reckoned with that’s about to become the top smartphone platform. This is like Linux becoming the most popular desktop OS in just a year, defeating both Mac OS and Windows. The soon-to-become-second-place smartphone platform, or Blackberry OS sits now at 31.6%. RIM’s OS is on a steep decline, falling from 37.3% in September and from 41.6% a year ago. Apple’s iOS kept hanging around the 25% mark, as it has been doing for more than a year. Although, that might change just a bit with the Verizon iPhone.

Slowly but surely, Windows Phone and WebOS both kept heading towards complete irrelevancy. Microsoft’s Windows Phone kept ceding ground through last year’s Christmas season. Even though Windows Phone 7 has been available for almost four months now, the OS hasn’t been able to bring the company back to the game. If things don’t turn around quickly for Windows Phone it might join WebOS in the sub-5% section pretty soon. Coming in on fifth and last place is HP’s WebOS, which kept heading towards the grave with a 3.7% market share. A drop from 4.2% in September and 6.1% a year ago.

Like I said last week, the fight is far from over in the mobile world. But things are looking pretty good for Android right now. comScore’s report is for December of 2010, meaning that Android probably already has or is about to blow past RIM’s Blackberry OS. If the trend continued throughout January (dotted lines), Android already is the biggest smartphone platform in the U.S. — with close to a 31% market share. Even more, Android could reach a +40% market share right before the year’s end. That’s a pretty big feat, if you ask me.

PS: I’ve been seeing a lot more Android phones than iPhones on the streets lately, what about you guys?

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